The utilizes a 4-way stretch neoprene and thin, super-soft foam to keep the vest snug to every contour of your body. The Reverb Vest incorporates an "X" shaped segmented back panel to give the rider 360° of mobility when tweaking grabs or getting inverted.• Not a U.S. Coast Guard Approved Life Jacket• Thin profile, 4-way stretch neoprene• Front zip with no straps or buckles to get in the way• "X" shaped rear panels for increased mobility• Contoured arm holes• Men's Chest Sizes: S(32"-36"), M(36"-40"), L(40"-44"), XL(44"-48") Front zip with no straps or buckles to get in the way Contoured arm holes Not a U.S. Coast Guard Approved Life Jacket | Men's Reverb Neo Vest